IBM 7013 J Series Operator's Manual page 20

The base unit consists of a floor standing unit, which may be expanded with the addition of
an expansion unit, positioned to the left of the base unit.
Both units have the same dimensions:
Height: 610 mm (24.1 in.)
Width: 360 mm (14.2 in.)
Depth: 750 mm (29.5 in.).
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Operator Guide